[clang][lib] Add __aeabi_mem* functions implementation
Clang optimizes certain copies/moves to use ARM eabi specific
functions (e.g. __aeabi_memcpy). This file provides weak
implementations of these functions that just call the original
function (e.g. memcpy) with the same arguments.
Change-Id: Icc4834f34b528acf65cc0717b1c585a4a0700cb5
diff --git a/lib/rt/__aeabi.c b/lib/rt/__aeabi.c
new file mode 100644
index 0000000..1620d45
--- /dev/null
+++ b/lib/rt/__aeabi.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(__clang__)
+// clang interprets -fno-builtin more loosely than you might expect,
+// and thinks it's okay to still substitute builtins as long as they're
+// named __aeabi_* rather than __builtin_*, which causes infinite
+// recursion if we have the fortified memcpy visible in this file.
+#undef _FORTIFY_SOURCE
+#endif
+
+#include <stddef.h>
+#include <string.h>
+
+extern int __cxa_atexit(void (*)(void*), void*, void*);
+
+// All of these are weak symbols to avoid multiple definition errors when
+// linking with libstdc++-v3 or compiler-rt.
+
+/* The "C++ ABI for ARM" document states that static C++ constructors,
+ * which are called from the .init_array, should manually call
+ * __aeabi_atexit() to register static destructors explicitly.
+ *
+ * Note that 'dso_handle' is the address of a magic linker-generate
+ * variable from the shared object that contains the constructor/destructor
+ */
+
+int __attribute__((weak))
+__aeabi_atexit_impl(void *object, void (*destructor) (void *), void *dso_handle) {
+ return __cxa_atexit(destructor, object, dso_handle);
+}
+
+int __attribute__((weak))
+__aeabi_atexit_impl2(void *object, void (*destructor) (void *), void *dso_handle) {
+ return __cxa_atexit(destructor, object, dso_handle);
+}
+
+
+void __attribute__((weak)) __aeabi_memcpy8_impl(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memcpy4_impl(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memcpy_impl(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memcpy8_impl2(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memcpy4_impl2(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memcpy_impl2(void *dest, const void *src, size_t n) {
+ memcpy(dest, src, n);
+}
+
+
+void __attribute__((weak)) __aeabi_memmove8_impl(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memmove4_impl(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memmove_impl(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memmove8_impl2(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memmove4_impl2(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+void __attribute__((weak)) __aeabi_memmove_impl2(void *dest, const void *src, size_t n) {
+ memmove(dest, src, n);
+}
+
+/*
+ * __aeabi_memset has the order of its second and third arguments reversed.
+ * This allows __aeabi_memclr to tail-call __aeabi_memset
+ */
+
+void __attribute__((weak)) __aeabi_memset8_impl(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+void __attribute__((weak)) __aeabi_memset4_impl(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+void __attribute__((weak)) __aeabi_memset_impl(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+void __attribute__((weak)) __aeabi_memset8_impl2(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+void __attribute__((weak)) __aeabi_memset4_impl2(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+void __attribute__((weak)) __aeabi_memset_impl2(void *dest, size_t n, int c) {
+ memset(dest, c, n);
+}
+
+
+void __attribute__((weak)) __aeabi_memclr8_impl(void *dest, size_t n) {
+ __aeabi_memset8_impl(dest, n, 0);
+}
+
+void __attribute__((weak)) __aeabi_memclr4_impl(void *dest, size_t n) {
+ __aeabi_memset4_impl(dest, n, 0);
+}
+
+void __attribute__((weak)) __aeabi_memclr_impl(void *dest, size_t n) {
+ __aeabi_memset_impl(dest, n, 0);
+}
+
+void __attribute__((weak)) __aeabi_memclr8_impl2(void *dest, size_t n) {
+ __aeabi_memset8_impl(dest, n, 0);
+}
+
+void __attribute__((weak)) __aeabi_memclr4_impl2(void *dest, size_t n) {
+ __aeabi_memset4_impl(dest, n, 0);
+}
+
+void __attribute__((weak)) __aeabi_memclr_impl2(void *dest, size_t n) {
+ __aeabi_memset_impl(dest, n, 0);
+}
+
+#define __AEABI_SYMVERS(fn_name) \
+__asm__(".symver " #fn_name "_impl, " #fn_name "@@LIBC_N"); \
+__asm__(".symver " #fn_name "_impl2, " #fn_name "@LIBC_PRIVATE")
+
+__AEABI_SYMVERS(__aeabi_atexit);
+__AEABI_SYMVERS(__aeabi_memcpy8);
+__AEABI_SYMVERS(__aeabi_memcpy4);
+__AEABI_SYMVERS(__aeabi_memcpy);
+__AEABI_SYMVERS(__aeabi_memmove8);
+__AEABI_SYMVERS(__aeabi_memmove4);
+__AEABI_SYMVERS(__aeabi_memmove);
+__AEABI_SYMVERS(__aeabi_memset8);
+__AEABI_SYMVERS(__aeabi_memset4);
+__AEABI_SYMVERS(__aeabi_memset);
+__AEABI_SYMVERS(__aeabi_memclr8);
+__AEABI_SYMVERS(__aeabi_memclr4);
+__AEABI_SYMVERS(__aeabi_memclr);
+
+#undef __AEABI_SYMVERS
diff --git a/lib/rt/rules.mk b/lib/rt/rules.mk
new file mode 100644
index 0000000..32a0126
--- /dev/null
+++ b/lib/rt/rules.mk
@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2015, Google, Inc. All rights reserved
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files
+# (the "Software"), to deal in the Software without restriction,
+# including without limitation the rights to use, copy, modify, merge,
+# publish, distribute, sublicense, and/or sell copies of the Software,
+# and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+MODULE := $(LOCAL_DIR)
+
+MODULE_SRCS += \
+ $(LOCAL_DIR)/__aeabi.c
+
+include make/module.mk
diff --git a/lib/trusty/rules.mk b/lib/trusty/rules.mk
index b625bfe..76039b7 100644
--- a/lib/trusty/rules.mk
+++ b/lib/trusty/rules.mk
@@ -61,6 +61,10 @@
lib/syscall \
lib/version \
+ifeq ($(call TOBOOL,$(CLANGBUILD)), true)
+MODULE_DEPS += lib/rt
+endif
+
GLOBAL_DEFINES += \
WITH_SYSCALL_TABLE=1 \
